In this work, we perform spectroscopic ellipsometry measurements at room temperature on mechanically exfoliated α-RuCl3 nanoflakes of different thickness for photon wavelengths ranging between 400 and 1000 nm. Our measurements allow us to estimate the wavelength-dependent complex refractive index along the crystal directions parallel and perpendicular to the layers, which reveal an anisotropy between the in-plane and out-of-plane optical properties of the material. Our results provide a valuable information about the optical properties of 2D α-RuCl3 flakes in the visible and near infrared, which are crucial to exploit this material in nanodevices with enhanced light-matter interactions.
While high index dielectrics and plasmonics offer many opportunities for research and techonology in the field of nanophotonics, 2D materials can expand this potential in the visible and near-infrared due to high refractive indices, a large range of transparency windows, and new fabrication possibilities due to van der Waals adhesion to any substrate. We extract dielectric constants of 11 layered materials including TMDs, III-VI semiconductors, and magnetics. We fabricate nanoantennas and observe Mie resonances as well as strong coupling of TMD excitons and anapole modes with Rabi splittings of 140 meV. We also observe room temperature Purcell enhancement of WSe2 monolayer emission and low temperature formation of single photon emitters with enhanced quantum efficiencies. Due to weak adhesion to the substrate, we employed an AFM tip in the repositioning of dimer nanoantennas to form ultra-small hotspots enabling optical trapping of quantum emitters with Purcell factors above 150.
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